CaS∶Eu,Sm及其在农用转光膜上的应用原理

利用稀土直接掺杂工艺合成了一种“常光充能”型电子陷获材料CaS∶Eu,Sm，它不仅具有CaS∶Eu无机发光材料的荧光光谱特性，而且具有红外升频转换特性，可将0.8～ 1.6μm的红外光直接转换为～672nm的红光、量子效率高达76%，是一种优于CaS∶Eu的光转换农膜添加剂.而共掺Eu2＋、Sm3＋和Cu＋的CaS荧光粉有望成为一种性能优于光转换农膜添加剂CaS∶Eu2＋，Cu＋、可人工模拟叶绿素吸收光谱的新型农用转光膜材料.

APPLICATION PRINCIPLE OF ELECTRON TRAPPING MATERIAL CaS∶Eu,Sm IN THE LIGHT CONVERSION AGRICULTURAL FILM

Electron trapping material CaS∶Eu,Sm has been prepared by the technique of rare earth doping directly.It can not only possess the fluorescent characteristics of CaS∶Eu,but also convert infrared light (0.8～1.6μm) to visible light (～672nm) and its quantum efficiency is more than 76%.According to the solar spectra and the best spectrum of plant growth as well as the fluorescence spectrum of CaS∶Eu,Sm,it is explained that CaS∶Eu,Sm phosphor is good additive of the light conversion agricultural film.Moreover,the absorption spectrum of chlorophyll photosynthesis can be imitated and infrared light can be converted to visible light by the light conversion agricultural film if CaS∶Eu2＋，Sm3＋,Cu＋ phosphor is used as additive,so it may be thought that CaS∶Eu2＋,Sm3＋,Cu＋ phosphor is better than CaS∶Eu2＋,Cu＋ phosphor as additive in the light conversion agricultural film.